Background video container won't apply overflow: hidden in Firefox

I’m trying to get firefox to apply overflow hidden to an container element with a video in it.

It works fine in Safari/Chrome, and works on one page in Firefox but not the other, even though as far as I can see there is no different in the markup.

Here’s the page where it isn’t working (it’s full-screen height): http://www.xnthony.com/xnto/index.php/blog

And the page where it’s working fine: http://www.xnthony.com/xnto/index.php/media

What am I missing here??

Sorry, those links were wrong, correct links:

JumpJump, the page that is not working contains several HTML errors that might be causing the problem. I’d suggest giving it a thorough run through the validator: http://validator.w3.org/

It might help.